Pulsator for milking machines



Patented Jan. 8, 1935 UNITED STATES PULSATOR FOR MILKING MACHINES Frantz Mortensen, Helsingfors, Finland, assignor singfors, Finland Application March 10,

to Maskin-och Brobyggnads Aktiebolaget, Hel- 1932, Serial No. 598,073

In Germany May 20, 1931 3 Claims.

This invention relates to improvements in pulsators for milking machines, and its objects are as follows:-

First, to provide a pulsator having a simplified and improved thrust pin structure for automatically throwing the pulsator valve to its extreme positions.

Second, to employ the main outlet of the pulsator block both as an air and milk passageway.

Third, to provide a trip valve for controlling the suction in the milk tube or tubes independently of the suction in the end chambers of the pulsator cylinder.

Fourth, to make the double-headed piston the common actuator of the pulsator and trip valve.

Other objects and advantages will appear in the following specification, reference being had to the accompanying drawing in which Figure 1 is a cross section of the improved pulsator, particularly illustrating the function of the main outlet asthe common passageway for the air and milk.

Figure 2 is a longitudinal section of the pulsator, particularly illustratingthe simplified and improved toggle or thrust pin structure.

Fig. 3 is a detail horizontal section taken on line 3-3. of Fig. 1.

In carrying out the invention provision is made of a pulsator block l'which includes an outlet 2 which is adapted to be set upon the milk receiving can. The outlet chamber 3 has communication with a hose nipple 4 which is adapted to be connected with a vacuum pipe. The block 1 also includes a boss 5 from which a plurality of nipples 6 extends. Only one of the nipples is shown in Figure 1.

The block 1 has a main air channel '7, the upper end of which communicates with a depressed face 8 of the block 1. This face lies transversely of the block, considering the block alone, but it actually extends longitudinally of the pulsator as clearly shown in Figure 2. The channel 7 has the foregoing communication with the face 8 in common with the adjacent ports 9, 10 of ducts 11, 12 which also extend longitudinally of the pulsator (Fig. 2).

A needle valve 13 controls the orifice 14 (Fig. 1) of the main air channel 7. This orifice communicates with a channel 15 in turn having communication with the outlet chamber 3. Suction occurring in the chamber 3 will be felt in the main air channel 7 by way of the orifice 14, and the degree of suction in the channel 7 is subject to regulation by manipulating the needle valve 13.

in one or the other direction. The adjustments of the needle valve are set by a lock nut 16. g Adjacent to one side of the depressed face 8 is an upstanding wall 1'7. This wall extends above a second face 18 on the block 1. The face 18 is actually on the 110555 as will be apparent in Figure 1. The face 18, like the face 8, extends longitudinally of the pulsator. v

A pulsator valve 19 bears on and traverses the depressed face 8 with an intermittent motion.

This valve is guided longitudinally of the pulsator by the base portion of the wall 17 along one side of the depression 8 and by the low wall 20 on the opposite side. This valve'has acentral cross-over port 21 and end ports 22, 23. The purpose of the cross-over port 21 is to effect registration of the main air channel 7 either with the ports 9 or 10, depending on the shifted'position of the valve 19. The purpose of the end'ports 22,

23 is to provide for an equalization of the air 20 pressure at opposite sides of thathead which happens not to be under the influence of suction.

Shifting of the pulsator valve 19 is accomplishedby a thrust pin 24 which extends/from the valve to a piston rod 25. The lower end of 25 the pin terminates in' a ball '26 which occupies and turns in a spherical socket 27 in the valve 19. I The upper end of the pin loosely carries a ball 28 which rests and turns in a socket 29 in the nether portion of a groove 30 of'the piston rod 25. A coil spring'3l is carried 'bythe pin 24 and presses outwardly on the balls 26, 28 keeping these in firm engagement with their sockets.

Heads 32, 33 attached to the opposite ends of the piston rod 25 occupy the chambers 34, 35 of what is herein collectively known as the pulsator cylinder. The piston heads are connected with the rod 25 by means of headed studs 36 which have a limited play in the correspondingly shaped slots 37 in the rod ends. The assemblage 25, 32 and 33 constitutes a double-headed piston, and this piston is the common actuator of the pulsator valve 19 and of a trip valve 38 (Fig. 1) which rides the second face 18 previously described.

It will be observed in Figure 1 that the trip valve 38 is separated from the double-headed piston by the wall 17, but this wall has openings 37a (Fig. 3) to let the studs 39 (Fig. 2) through, these studs being carried by the piston rod 25 and bringing the trip valve 38 to its two different positions. A guide member 40, carried by the wall 17, has arms 41 which extend forwardly from the Wall and have slightly angled portions to so embrace the piston rod 25 as to guide it in its rectilinearmovements. I

The chambers 34, 35 are attached to the pulsator block in any suitable way. There is a space between the confronting ends of these chambers, the extent of this space being measured by the longitudinal dimension of the block 1. The ends of the chambers 34, 35 project at the ends of the face 8 to form valve stops 34, 35 This space is enclosedby-acoyer 42 (Fig. 1-) which is hinged to the boss 5 as at 43.

Returning to the chambers 34, 35 it is to be observed that these have passages 44, 45 respec tively. The near ends of the passages .communi cate with the ducts 11, 12. The far ends of the passages communicate with the, remote ends. of. the chambers 34, 35. The purpose oi -the duct and.

passage arrangements is to conduct air either .from or into the chambers 34,; 35. I

In further reference to the trip valve 38, this is:

appropriately ported at 38 (Fig. 3) on the nether side so as to alternately connect channels 46"wi'th I aichannel =4'1. These, channels. are connected with the air. nipple 6, the. hose. connections of which lead to teatcups. The. channel 47 communicates witl the chamber 3'and themilk. drawninto the channel-,4! is discharged thereby into the chambent. and consequently into the receiving can.

Theoperationi readily nderst od.

Consider the positionof the pulsator in Figure 2.. Thesuotion, which is. regarded as. being present-in the hose nipple 4 (Fig. l) is traced through the'channel, 1 5, orifice 14, main. air channel 7, cross over port 21 (Fig. 2), port 9, duct 11 and passage 44 to the chamber 34. This causes the double-headed piston tov move to the left. The

registering ports. 10. and 23, enable an equalizationcf f the air pressure. on opposite sides of the advancing head The pulsator valve 19. remains in the shifted nqsitionag ainstthe ,stop..34. until the thrustpin 24passesthevertical dead, center. The spring 31 is. put under tension by theadvance of the doubleheadedipiston, thenv expands. and quickly drives the, pulsatorvalve 19 to itsother positionagainst the stop 359, the double-theaded piston then being in a positionopposite to that shown in Figure 2.

At the Same timethe right hand stud 39. will move the; tripvalve; 38. (Fig. 1) whereby at least one. Of. the; teat cups. is placed under. suction through the nipple. 6. and one of the channels. 46. The. now shifted double-headed piston will reverse its. motion by virtue of the reversal of the pulsator valve 19, and eventually will again cause the shifting of the valves 19, 38 thereby to expose the two teat cups previously under suction to the atmosphere, and to connect the remaining two teat cups with the suction.

l. A pulsator assemblage comprising a block and cylinder passage, an air nippleiand plural m-ilknipples attached to the block, said block having an outlet chamber with which said nipples have common communication, a piston structure operable in said assemblage by the suction of air in said air nipple, and a trip valve operable by the piston structure and controlling the communication of said chamber with said milk nipples to set up pulsations in teat cups connected therewith.

2. .A pulsator comprising a block and cylinder assemblage, an air nipple and plural milk nipples attached to the block, said block having an outlet chamber with which said nipples have common communication, a. pistonstructure operable? in said assemblage by air suction in said air nipple, studs in spaced relationship to each other and projecting fromsaid piston structure, and artrip valve controlling the communication of said milk nipples with said chamber, said valve being moved in alternately opposite directions by the, respective studs thereby to. set uppulsationsin teat cups connected with the milk nipples.

3. A pulsator comprisinga block having adepressed, face with ports-and a. main air channel in communication therewith, said ports having ducts communicating with the ends, of, the block, said block having an outlet chamber in communication with the main air channel, said chamber being subject to suction, an upstanding wall on the block adjacent to, said, face, said block havinga second facev on the side of the wall oppos site to the depressed face, chambers, attached to the block, said chambershaving passages connecting theends thereof with saidducts, a double-headed piston operable in the chamber inl din a rod connecting, the. eads;.. a po pulsator valve en ag the d p ssed ace,v a ported tripvalve engaging the second face, means operable-bythe rodto pglio'dically shift the pillsator valve, other means carried bythe rod to, periodically shiftvthetrip valve, and guide means carriedby the wall to; steady the piston rod.

FRANTZ MORTENSEN. 

